Sonic Pi - Sonic Pi is a new kind of instrument for a new generation of musicians. It is simple to learn, powerful enough for live performances and free to download.
Chart.js - Easy, object oriented client side graphs for designers and developers.
SuperCollider - A real time audio synthesis engine, and an object-oriented programming language specialised for...
D3.js - D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG, and CSS.
ChucK - A strongly-timed music programming language
Google Charts - Interactive charts for browsers and mobile devices.